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11-23-2009, 01:01 PM
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Junior Member
Join Date: Sep 2008
Location: Moore, OK
Posts: 54
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question on matching head numbers
I found a set of heads that match the casting number I need except it has an x at the end of it. Is this still a legal head? What does the x mean?
NHRA/GM allowable casting numbers: 3998991 or 3986339 found a set with 3986339x thanks,
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Tim Wilson HR/SST 4301 |
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